Willow Creek is an unincorporated community and census-designated place in Gallatin County, Montana, United States. The population was 210 at the 2010 census. It is part of the Bozeman, MT Micropolitan Statistical Area.Willow Creek is located in western Gallatin County at 45°49′38″N 111°38′7″W / 45.82722°N 111.63528°W / 45.82722; -111.63528, where the valley of Willow Creek enters the valley of the Jefferson River. It is 6 miles southwest of Three Forks and 7 miles southwest of Interstate 90.According to the United States Census Bureau, the CDP has a total area of 2.73 square miles, all of it land.As of the census of 2000, there were 209 people, 81 households, and 52 families residing in the CDP. The population density was 192.4 people per square mile. There were 84 housing units at an average density of 77.3 per square mile. The racial makeup of the CDP was 92.34% White, 0.96% Asian, 0.48% Pacific Islander, 3.83% from other races, and 2.39% from two or more races.